Predicate System ​
How it works ​
Developers may allow certain actions to be performed by other accounts at the cost of their own POWER resources using the allowpred action. Resources may be revoked using the revokepred action. Developers may also specify a predicate action to call to verify if this action should be paid or not (e.g. check that a user is a premium user or is whitelisted).
Relevant Actions ​
revokepred - reset a predicate